Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Finite Element Analysis of Mechanical Behavior of Bolt Tightened in Plastic Region

소성역 체결 볼트의 기계적 거동 유한요소해석

  • Cho, Sung-San (Department of Mechanical & System Design Engineering, Hongik University) ;
  • Shin, Chun-Se (Department of Mechanical & System Design Engineering, Hongik University)
  • 조성산 (홍익대학교 기계시스템디자인공학과) ;
  • 신천세 (홍익대학교 기계시스템디자인공학과)
  • Received : 2009.05.04
  • Accepted : 2009.11.16
  • Published : 2010.05.01
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Abstract

Plastic region tightening is widely used in critical bolted joints in internal combustion engines in order to reduce the engine weight by maximizing the use of load-carrying capacity of bolt. Mechanical behavior of bolt tightened in plastic region under external axial tensile load is investigated for various friction conditions using three dimensional finite element analysis. The behavior of bolt tightened in elastic region as well as that in tensile test are investigated for comparison. Tightening process is simulated by rotating the bolt in order to examine the friction effect realistically. It is revealed that the bolt tightened in plastic region can carry more external load until the joint is opened, and yields at lower bolt load than the bolt tightened in elastic region. The friction coefficient has effect on the yield load, but not on the load-carrying capacity. Moreover, the scatter in the bolt preload due to friction begins with plastic deformation of bolt in the angle tightening control, whereas it begins with the onset of tightening in the torque tightening control. The observations are interpreted with the residual torsional stress in the bolt generated during the tightening.

Keywords

References

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